Daikin C-Series, Руководство по обслуживанию

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Troubleshooting SiBE07-618_C
90 Service Diagnosis
4.23 Refrigerant Shortage
Remote
Controller
Display
U0
Method of
Malfunction
Detection Refrigerant shortage detection I:
Refrigerant shortage is detected by checking the input current value and the compressor output
frequency. If the refrigerant is short, the input current is smaller than the normal value.
Refrigerant shortage detection II:
Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of
the electronic expansion valve. If the refrigerant is short, the discharge pipe temperature tends
to rise.
Malfunction
Decision
Conditions Refrigerant shortage detection I:
The following conditions continue for 7 minutes.
Š
DC current
≤
× Output fre
Š
Output frequency >
Refrigerant shortage detection II:
The following conditions continue for 80 seconds.
Š
Target opening of the electronic expansion valve
≥
Š
Discharge pipe temperature > × target discharge pipe tempe
„
If the error repeats 4 times, the system is shut down.
„
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
„
Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor
„
Closed stop valve
„
Refrigerant shortage (refrigerant leakage)
„
Poor compression performance of compressor
„
Defective electronic expansion valve
(–) (A) (Hz)
18/1000 0.7 55
(pulse) (–)
(°C)
50 class 480 128/128 Cooling: 20, Heating: 45
60 class 480 128/128 Cooling: 60, Heating: 45